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Herwig++ 2.2 Release Note

M. Bahr, S. Gieseke, M. Gigg, D. Grellscheid, K. Hamilton, O. Latunde-Dada, S. Platzer, P. Richardson, M. H. Seymour, A. Sherstnev, B. R. Webber

TL;DR

Herwig++ 2.2 extends hadron-hadron event generation with new matrix elements for electroweak boson production in association with jets and with the Higgs, and incorporates a matrix-element correction for Higgs production via gluon fusion. It also adds a small-x PDF saturation model, expands output options, retunes hadronization and underlying-event parameters, and includes a broad set of bug fixes to improve robustness. The release is validated against existing collider data and sets the stage for future major upgrades, with a roadmap toward version 3.0 and the planned phase-out of the FORTRAN version. Overall, the update enhances the physical realism and usability of Herwig++ for realistic hadron-hadron simulations.

Abstract

A new release of the Monte Carlo program Herwig++ (version 2.2) is now available. This version includes a number of improvements including: matrix elements for the production of an electroweak gauge boson, W and Z, in association with a jet; several new processes for Higgs production in association with an electroweak gauge boson; and the matrix element correction for QCD radiation in Higgs production via gluon fusion.

Herwig++ 2.2 Release Note

TL;DR

Herwig++ 2.2 extends hadron-hadron event generation with new matrix elements for electroweak boson production in association with jets and with the Higgs, and incorporates a matrix-element correction for Higgs production via gluon fusion. It also adds a small-x PDF saturation model, expands output options, retunes hadronization and underlying-event parameters, and includes a broad set of bug fixes to improve robustness. The release is validated against existing collider data and sets the stage for future major upgrades, with a roadmap toward version 3.0 and the planned phase-out of the FORTRAN version. Overall, the update enhances the physical realism and usability of Herwig++ for realistic hadron-hadron simulations.

Abstract

A new release of the Monte Carlo program Herwig++ (version 2.2) is now available. This version includes a number of improvements including: matrix elements for the production of an electroweak gauge boson, W and Z, in association with a jet; several new processes for Higgs production in association with an electroweak gauge boson; and the matrix element correction for QCD radiation in Higgs production via gluon fusion.

Paper Structure

This paper contains 6 sections, 1 figure.

Table of Contents

  1. Introduction
  2. Availability
  3. New Matrix Elements
  4. Higgs Matrix Element Correction
  5. Other Changes
  6. Summary

Figures (1)

  • Figure 1: The transverse momentum of the Higgs boson at the LHC for a Higgs boson with mass a) 115 GeV and b) 300 GeV. The results of the full correction (solid), no correction (dashed), only the soft matrix element correction to radiation generated by the parton shower (dotted), and the hard correction filling the 'dead' region not filled by the parton shower (dot-dashed) are shown.